Add HashMap to Firebase Real-time Database with Uid, Date in Android Studio

 

public void addToCart(View view){

    String uid = FirebaseAuth.getInstance().getUid();
    calendar = Calendar.getInstance();
    date = DateFormat.getDateInstance().format(calendar.getTime());

    HashMap<String, Object> map = new HashMap<>();
    map.put("ProductId", pid);
    map.put("Quantity", pQuantity.getText().toString());
    map.put("Amount", pTotal.getText().toString());
    map.put("Weight", pItemsWeight.getText().toString());
    map.put("Title", pTitle.getText().toString());
    map.put("Image", im);
    map.put("Date", date);

    FirebaseDatabase.getInstance().getReference().child("Hospital").child("Users").child(uid).child("Cart").child(pid).updateChildren(map).addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void unused) {
            Toast.makeText(ProductActivity.this, "கூடையில் சேர்க்கப்பட்டது", Toast.LENGTH_SHORT).show();
            startActivity(new Intent(ProductActivity.this, CartActivity.class));
        }
    });
}